Rudd and Mann are reprising their characters of husband and wife from Apatow's Knocked Up in a new story by the writer-director.

Fox's role is being kept under wraps.

Apatow is producing the movie with Barry Mendel and Clayton Townsend.

The Apatow picture marks a return to the studio world for Fox who recently wrapped Friends With Kids opposite Jon Hamm, Kristen Wiig and Adam Scott for Jennifer Westfeldt, who wrote and directed. The actress was last seen in the indie fable Passion Play opposite Mickey Rourke.

Fox is repped by ICM and attorney Darren Trattner.

Universal�s vp of production Erik Baiers is overseeing the project for the studio.